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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4827a5792a192822993449d37eca1ceea02fd379552c60045c6880085f6a6b33' 
  AND token = 'k+kYnBCGoUvwI27hfrgFen6v7GnxIuvrbbFD2eij1tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}